Circuit-closer for bu rglar-alarms



2 Sheets-Sheet 1.

Patented June 30,1891

D. A. PALMER.

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CIRCUIT CLOSER FOR BURGLAR ALARMS.

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CIRCUIT CLOSER FOR BURGLAR ALARMS.

Patented June 30,1891.

UNITED STATES PATENT ()EEIGE.

DON A. PALMER, OF CHICAGO, ILLINOIS.

CIRCUIT CLOSER FOR BURGLAR ALARMS.

SPECIFICATION forming part of Letters Patent N0.455,005, dated June 30, 1891.

Application filed May 26, 1890. erial No. 353,200. (No model.)

To aZZ whom it may concern:

Be itknown that I, DON A. PALMER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvementin Circuit Closers, (Case 2,) of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to burglar-alarm apparatus; and its object is to provide a cheap, convenient, and reliable circuit-closer adapted to be operated to make or break a contact by the movement of the saslrcord over the sash-pulley.

My invention consists in a slotted sash-pulley frame provided with suitable insulated contact-points with which the pulley, moving in the slots, is adapted to engage when rotated by the movement of the sash-cord over the same.

My invention will be more readily understood by reference to the accompanying drawings, in which Figure 1 illustrates a circuit-closer embodying my invention placed in the frame of a window. Fig. 2 is a side elevation, partly in section, of a circuit-closer embodying my invention. Fig. 3 isa front view of the same on line w 0: of Fig. 2. Fig. 4 is a sectional elevation on liney'yof Fig. Fig. 5showsamodification of my device. Fig. 6 is a sectional elevation of my circuit-closer as used in connection with a wooden pulley. Fig. '7 is a front view thereof.

Like parts are indicated by similar letters of reference throughout the different figures.

In Figs. 1, 2, 3, and 4 the pulley a is provided in the slotted casting I), and is adapted to move backward and forward in the slot 0 therein. The contact-spring (Z is secured to the casting Z), but is insulated therefrom by the block c, as shown. The terminals of the alarn1-circuit f, containing the battery and bell, are connected with the frame or casting b and to the contact spring (Z, respectively. Now when the sash g is raised the sash-cord h is drawn over the pulley, thereby revolving the pulley on its shaft and rolling the same back into the other end of the slot 0, thereby bringing the pulley a into engagement and cont-act with the spring (I, thus closing the alarm-circuit to sound the said bell.

In Fig. 1 the arrangement is such that contact will be made when the sash raised, while in Figs. 2 and 4. contact will be made only on lowering the sash.

Fig. 5 shows a modification of my circuitcloser, in which the pulley 1 swings on the yoke j and in the curved slot 7.1, provided in the side of the casting 1. Two contact-points are provided, so that the movement of the cord either up or down over the pulley will close contact.

In Figs. 6 and T I have shown the arrangement of the circuit-closer when used in conneotion with a wooden pulley and also a peculiar form of insulating-block, and means for securing the same to the casting of the pulley.

The casting m is provided with the grooves m, in which the hub of the pulley rolls. The pulley is prevented from coming out of the grooves by the stop-pinm (indicated in dotted lines.) The lower part of the casting is cut away, as shown, and adapted to receive the groovedinsulating-blockm. This block is secured in place by the screwmflinserted through the front of the casting m. A spring is provided on the block m" and is adapted to close down upon the spring m, insulated therefrom, when the pulley is forced over against the spring in". A small pulley is providedin the end of the spring in, in order that the f riction and wear on the pulley may be as slight as possible.

Having thus described my invention, I claim as new and desire to secure by Letters Patent .1. The combination, in a circuit-closer,of the frame-casting provided with slots, a cord-pulley adapted to revolve upon a suitable shaft in said slots as in bearings, and an insulated spring contact secured upon said casting, whereby contact will be made or broken when the said pulley is revolved by the sashcord moving over the same.

3. The combination of the casting l), the slots 0 therein, with the cord-pulley a, adapted to revolve in said slots 0 and to move back ward and forward therein, the insulatingb1oek,and the spring-contact secured thereon, 1 upon the yoke j, pivoted upon the said frame the whole adapted to be placed in a window- Z, and the spring-contacts, as shown.

[0 frame and to take the place of the ordinary In witness whereof I hereunto subscribe sash-pulley, substantially as shown and deniynzune this 3rd day of May, A. D. 1890. 5 scribed.

3. In a eireuit-o1oser, the combination of \Vitnesses: the frmnel, provided with the openings or slots J. V. COYLE, k, with the cord-pulley i suspended thereon l S. A. BUCHANAN.

DON A. PALMER. 

